"A.Grnd" - From J4 (A4) - (Is that 'all ground'?)
"V.Batt" - From J4 (A5) - (Something battery?)
"Logic Grnd" - From J4 (A2)(B3)(C3) and J5 (B4) - (Special Ground?)
"Reset" - From J4 (C3) - (I heard a rumor that this wire was key?[This is
specific to Tron])
"Unreg" - From J5 (A1) - (Unregulated?What does that indicate?)


Note the "J4"and "J5" indicate the connector, the (letter/number) code
indicates the position as noted on the tables he PS Test Results Table
(http://home.earthlink.net/~rescuetron/docs/pstest.htm)


"A.Grnd" - From J4 (A4) - (Is that 'all ground'?) Analog Ground.
Ground of the analog section of the circuit. This is separated from
the logic ground in order to prevent ‘digital noise' from getting into
the audio.
"V.Batt" - From J4 (A5) - (Something battery?) Yes, probably the
supply from a battery.
"Logic Grnd" - From J4 (A2)(B3)(C3) and J5 (B4) - (Special Ground?)
Ground of the logic section of the circuit.
"Reset" - From J4 (C3) - (I heard a rumor that this wire was key?[This
is specific to Tron]) Can't help you here other than the obvious.
"Unreg" - From J5 (A1) - (Unregulated? What does that indicate?)
Unregulated. This is the rectified and smoothed voltage from the
transformer before it feeds the voltage regulators. For the 15V
winding, this voltage would be around 21V with the supply unloaded.
The 5V unreg supply is probably from the 8V transformer winding which
would be at around 11.2V when unloaded.